Map Showing Generalized Thickness Contours of the Pittsburgh Coal Bed in Pennsylvania, West Virginia, and Maryland

Compilation by Susan Tewalt, Leslie Ruppert, Linda Bragg, Richard Carlton, David Brezinski, and Rachel Wallack;
Digital Compilation by Susan Tewalt, Leslie Ruppert, Rachel Wallack, and Eric Weiss

U.S. Geological Survey Open-File Report 97-748

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